>thankyou she hasnt got fleas
Then no need whatsoever to treat her for them. Honestly! I have a houseful of dogs and haven't flea treated for years! And I haven't seen a flea.
If it isn't necessary, then tell your friend that her bitch will be just fine without a "preventative."
If she does have fleas, come back and let us know, and we will advise a safe treatment for bitches in whelp.